I have prepared a small project and I’m facing a logical error. This function in operations.py
called land_available is supposed to check if the land is available or not by reading a data.txt file and if yes then this function rent land is supposed to run. But it’s not running. Can you help please I am in big dilemma right now.

i tried:
|————————————————————————————————————-|
| The basic information of the company |
|————————————————————————————————————-|
Type 1 to rent land
Type 2 to return land
Type 3 to dislpay land
Type 4 to exit the system
Enter a value:1
101 Bhaktapur West 3 70000 Available
102 Kathmandu South 1 20000 Not Available
103 Dhankuta North 10 60000 Available
104 Dhangadi East 7 90000 Available
Invalid data for key 105.
enter the required kitta number101
Sorry, land is not available
Do you want to continue renting (yes/no):

i was expecting the rent_land function to work

here is the code 

main.py :
from read import *
from operations import *

def main():
    print("t |-------------------------------------------------------------------------------------------------------------|")
    print("t |                                      The basic information of the company                                   |")
    print("t |-------------------------------------------------------------------------------------------------------------|")

    # Called read_data() to get the data
    a = read_data()
    keepRunning = True
    
    while keepRunning == True:
        
        print("Type 1 to rent land ")
        print("Type 2 to return land ")
        print("Type 3 to dislpay land ")
        print("Type 4 to exit the system ")
        userOption = int(input("Enter a value:"))
        if userOption == 1:
            

            #to make sure user wants to continue
            renting = True
            while renting == True:                
                #displayed land information ask kitta no, validate it no,
                displayer(a)  # Pass the values of the dictionary to the display function

                #taken inputs from the user to rent the land
                kitta_number = int(input("enter the required kitta number"))
                if exist(kitta_number) and land_available(kitta_number):

                    Customer_name = input("Enter your name")
                    duration = int(input("Enter the duration of renting"))                    

                    #called the function rent_land with the inputs as arguments passed 
                    rent_land(kitta_number,Customer_name,duration)
                
                userInput = input("Do you want to continue renting (yes/no): ").lower()
                if userInput != "yes":
                    renting = False

        elif userOption == 2:
            #return land similar to rent
            print("Call method to return land ")
        elif userOption == 3:
            # Call read_data() to get the data1
               
                displayer(a)  # Pass the values of the dictionary to the display function


        elif userOption == 4:
            print("You are exiting the system")
            keepRunning = False
        else:
            print("Enter valid input only 1 or 2 or 3")


main()


operations.py:

from read import read_data
from read import read_invoice
from write import *




#function to rent a land 
def rent_land(kitta_number, Customer_name, duration):
    if exist(kitta_number) and land_available(kitta_number):
        rent(kitta_number,Customer_name,duration)
        print("Rental successfull")
        generate_invoice(kitta_number, Customer_name, duration)

    else:
        print("Sorry, the land's not available")

#function to check if available

def exist(kitta_number):
    
    land_data = read_data()
    
    if kitta_number in land_data:
        return True
    else:
        print("The land with kitta number " + str(kitta_number) +" doesn't exist")


def land_available(kitta_number):
    land_data = read_data()  
    for data in land_data.values():
        
        availability = data[-1]  
        if availability == "Available":
            return True
        else:
            print("Sorry, land is not available")
            return False
    print("The selected kitta number is not found.")
    return False





def rent(kitta_number,Customer_name,duration): 
    land_data = read_data()

    if kitta_number in land_data:
        land_data[kitta_number][-1] = "Not Available"
        write_data(land_data)
    else:
        print("The land with" + kitta_number +" doesn't exist")






def generate_invoice(kitta_number, Customer_name, duration):
    land_data = read_data()  
    for data in land_data.values():
        
        cost = data[-2]
        place = data[2]
        write_invoice(kitta_number,place, Customer_name, duration,cost)
        
        read_invoice()

read.py:
def read_data():
    with open("data.txt", 'r') as file:
        Kitta_dictionary = {}
        kitta_no = 101
        for line in file:
            line = line.strip()  # Remove leading/trailing whitespaces including 'n'
            Kitta_dictionary[kitta_no] = line.split(',')
            kitta_no += 1
        return Kitta_dictionary  # Return the dictionary instead of printing it



# Display function
def displayer(data):
    for key, row in data.items():
        if not row or len(row) < 5:  # Check if row is empty or has fewer than 6 elements
            print(f"Invalid data for key {key}.")
            continue
        print(row[0] + ' '*(15-len(row[0])) +
              row[1] + ' '*(15-len(row[1])) +
              row[2] + ' '*(15-len(row[2])) +
              row[3] + ' '*(15-len(row[3])) +
              row[4] + ' '*(17-len(row[4])) +
              row[5])




def read_invoice():
    # Read the contents of the invoice file
    with open("invoice.txt", "r") as file:
        return file.read()

write.py:
from datetime import datetime

def write_data(data):
    with open("data.txt", 'w') as file:
        for kitta, data in data.items():
            line = ','.join(data)  # Convert the data tuple to a string
            file.write(line + 'n')

            

def write_invoice(kitta_number, place, Customer_name, duration, cost):
    # Get the current date and time
    current_datetime = datetime.now()

    # Format the datetime object as a string
    formatted_datetime = current_datetime.strftime("%Y-%m-%d %H:%M:%S")

    with open("invoice.txt", "w") as file2:
        file2.write("-------------------------------------------   Invoice  -----------------------------------------------------n")
        file2.write("                                  " + str(formatted_datetime) + "                                                    n")
        file2.write("LAND: " + str(kitta_number) + "                   Location: " + place + "n")
        file2.write("         Duration of rent: " + str(duration) + "     Cost:" + str(cost) + "n")
        file2.write("                          Rented By:" + Customer_name + "n")
        file2.write("------------------------------------------------------------------------------------------------------------n")


data.txt:
101, Bhaktapur, West, 3, 70000, Available
102, Kathmandu, South, 1, 20000, Not Available
103, Dhankuta, North, 10, 60000, Available
104, Dhangadi, East, 7, 90000,  Available